Average Co-Inventor Count = 4.91
ph-index = 3
The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.
Company Filing History:
1. Pullman-holt Corporation (3 from 3 patents)
3 patents:
1. 6363574 - Vacuum cleaner
2. 6219880 - Vacuum cleaner
3. D422386 - Vacuum cleaner